Until Kristallnacht pogrom, which occurred on 9–10 November 1938, Gebel worked as chief secretary for the Jewish merchant Max Uhlfelder in Munich.
Gebel and her brother Willy were members of the Aufbruch working team, and later of the communist resistance group led by Beppo Römer and Robert Uhrig.
[2] On 20 June 1944, she was sentenced to one year and four months of forced labour in jail, and had to work as a bookkeeper for the Nazi administration.
Sophie Scholl, her brother Hans and their friend Christoph Probst were sentenced to death and hurriedly executed on 22 February 1943.
After World War II, Gebel kept many memories of her cellmate, which were presented in film in Fünf letzte Tage (1982) and Sophie Scholl – The Final Days (2005).